CN215413089U - Drying roller - Google Patents

Abstract

The utility model relates to a drying roller, which comprises a roller body, wherein a heat exchange space is formed in the roller body, shaft fixing holes are formed in two ends of the roller body, and a bearing is arranged at each group of shaft fixing holes; the connecting shaft is rotationally connected with the bearing and drives the roller body to rotate; the connecting shaft is a hollow shaft; the connecting shaft is fixedly supported on the support, a circulation channel of a drying medium is arranged in the support, the circulation channel is communicated with the connecting shaft and the heat exchange space, and a drying medium inlet and a drying medium outlet are arranged on the circulation channel. The utility model discloses a drying roller, wherein a drying medium enters a heat exchange space through a drying medium inlet, a circulation channel and a connecting shaft, when the drying medium meets the inner wall of the drying roller, water vapor is condensed into liquid water, heat energy is released at the same time, the heat energy is transferred to a material to be dried through a roller surface, and the liquid water is deposited in the drying roller and is discharged through a drying medium outlet. The roller surface and the heating plate dry and roll materials together, so that the drying efficiency of the materials is improved.

Description

Drying roller

Technical Field

The utility model relates to the technical field of drying of powdery, pasty and cake-shaped materials, in particular to a drying roller.

Background

The drying process is a process of removing moisture in wet materials, and generally adopts a thermophysical method, namely, the wet materials are heated to evaporate the moisture in the wet materials, so as to achieve the aim of drying. The conventional heat transfer modes of the drying equipment comprise convection heat transfer and conduction heat transfer, wherein hot air, hot flue gas, superheated steam, hot inert gas and the like are used as drying media in the convection heat transfer, the drying media are directly contacted with wet materials, and heat is transferred to the wet materials in the convection mode. In the case of convective heat transfer, the drying medium is both a heat carrier and a moisture carrier. Conduction heat transfer utilizes conduction oil, steam, hot water and the like as drying media, the drying media are not in direct contact with wet materials, and heat is transferred to the wet materials in a heat conduction mode. When conducting heat transfer, the drying medium is only the heat carrier.

Because the latent heat of vaporization of water is very large, when the moisture content of the wet material is large, the drying process belongs to a strong heat exchange process, taking 1kg of water evaporated every second as an example, the heat exchange power is about 2300kw, so the processing capacity of the current drying equipment for the material with the large moisture content (80% moisture content) is very low.

The convection heat transfer drying equipment has the advantages of high heat exchange speed and larger single machine handling capacity than the conduction heat transfer drying equipment. The disadvantages are that a large amount of drying medium is consumed, a large amount of drying exhaust gas is generated, the heat utilization rate is lower than that of a conduction heat transfer device, and the conveying cost of the drying medium and the exhaust gas treatment cost are high. The conduction heat transfer drying equipment has the advantages that the heat carrying capacity of the drying medium is high, the consumption of the drying medium is low, and the drying medium can be recycled; the heat utilization rate is higher than that of convection heat transfer equipment; the dry off-gas is significantly less than in convective heat transfer devices. The disadvantages are slow heat exchange speed and low single machine processing capacity.

The applicant finds that the currently and commonly used conduction heat transfer type drying machines are double-cone rotary drying machines, disc drying machines, rake drying machines and paddle drying machines, the traditional conduction heat transfer type drying machines mostly adopt a mode of stirring materials by using a rotating rake (disc drying machines) or directly stirring materials by using a heat conduction element (such as paddle drying machines) in order to improve the contact between the materials and a heat exchange surface, when the traditional drying machines work, the dried materials and the surface of the heat conduction element are in a loose contact state, or the dried materials are scattered on the surface of the heat conduction element by self gravity, or the heat conduction element is stirred in the dried materials, and because the contact state between the dried materials and the surface of the heat conduction element is not tight enough, gaps are also formed between the dried materials, the heat exchange coefficient is low and is generally 100-150W/(m & lt/m & gt)²(. degree. C.).

In the traditional drying model of the dryer, the drying medium is saturated steam, the heat conducting element is a carbon steel plate, and the dried material is municipal sludge. The heat is transferred to the carbon steel plate during steam liquefaction, and then is transferred to wet sludge in contact with the carbon steel plate through the carbon steel plate, the wet sludge is dried on the surface of the carbon steel plate to form a dry sludge thin layer, and the heat passes through the dry sludge layer to continue to transfer the wet sludge for drying. The carbon steel plate is a good thermal conductor, the thermal conductivity is 40W/(m DEG C), the thermal conductivity of the dry sludge (see loose inorganic materials of 0.29 boiler slag, 0.23 fly ash and 0.26 blast furnace slag in appendix B of civil construction thermal design specification GB 50176-2016) is about 0.23-0.29W/(m DEG C), and the loose dry sludge has poor thermal conductivity, and the applicant proves through experiments that the improvement of the heat transfer between the carbon steel plate and the sludge and the internal heat transfer of the sludge are the key points for improving the drying efficiency. The traditional dryer adopts a stirring mode, improves the contact between sludge and a carbon steel plate and the contact between dry sludge and wet sludge, and achieves the aim of improving the drying efficiency. The applicant researches and grinds the dried materials by using the drying roller and the drying disk, so that the dried materials form a compact material layer between the drying roller and the drying disk, the material layer is in close contact with the heat exchange surfaces of the drying disk and the drying roller, and the heat transfer speed from the drying disk and the drying roller to the dried materials is greatly improved. Because the material to be dried is rolled into a compact material layer, the heat transfer speed inside the material to be dried is also greatly improved, so that the drying efficiency is improved by multiple times compared with that of the traditional dryer.

In the prior art, a drying roller used in cooperation with a drying tray is not available, and how to provide the drying roller is a problem to be solved by those skilled in the art in order to achieve a better drying effect.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model aims to provide a drying roller, which solves the problem of grinding materials by matching with a drying disc.

The present invention provides a drying roller, comprising:

the roller comprises a roller body, wherein a heat exchange space is formed inside the roller body, two ends of the roller body are respectively provided with a shaft fixing hole, and a bearing is arranged at each group of the shaft fixing holes;

the connecting shaft is rotationally connected with the bearing and drives the roller body to rotate; the connecting shaft is a hollow shaft;

the support, the connecting axle fixed stay in on the support, the circulation passageway that has dry medium in the support, the circulation passageway with the connecting axle the heat transfer space intercommunication, just it has dry medium entry and dry medium export to circulate on the passageway.

According to the technical scheme, compared with the prior art, the drying roller disclosed by the utility model has the advantages that the drying medium enters the heat exchange space through the drying medium inlet, the circulation channel and the connecting shaft, when the drying medium meets the inner wall of the drying roller, water vapor is condensed into liquid water, heat energy is released at the same time, the heat energy is transferred to a material to be dried through the roller surface, and the liquid water is deposited in the drying roller and is discharged through the drying medium outlet. The roller surface and the heating plate dry and roll materials together, so that the drying efficiency of the materials is improved.

The support of the drying roller is driven by external power, so that the roller body rotates on the surface of the drying disc.

Further, the roller body is in a cone frustum shape, and the contact working surface of the roller body is flush with the horizontal plane.

Further, the roll body comprises a first end panel, a second end panel and a roll surface body which are welded.

Further, the roll surface body is made of steel.

Further, the roll surface body is cast or formed by plate roll welding.

Furthermore, the connecting shaft adopts two sections of shafts, and the two sections of shafts rotate at the two groups of bearings in a one-to-one correspondence mode.

Furthermore, a water pumping pipe with a downward opening is arranged on the inner side of the connecting shaft close to one side of the drying medium outlet and is connected with an external water pumping device.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of a dryer roll according to the present invention;

in the figure: 1-roller body, 11-heat exchange space, 12-first end panel, 13-second end panel, 14-roller body, 2-connecting shaft, 3-bearing, 4-bracket, 41-drying medium inlet, 42-drying medium outlet, 5-water pumping pipe and J-liquid water.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1, an embodiment of the present invention discloses a drying roller, including: the roller comprises a roller body 1, wherein a heat exchange space 11 is formed inside the roller body 1, shaft fixing holes are formed in two ends of the roller body 1, and a bearing 3 is arranged at each group of shaft fixing holes; the connecting shaft 2 is rotationally connected with the bearing 3 and drives the roller body 1 to rotate; the connecting shaft 2 is a hollow shaft; the support 4, connecting axle 2 fixed support have the circulation passageway of drying medium in the support 4 on the support 4, and the circulation passageway communicates with connecting axle 2, heat transfer space 11, and has drying medium entry 41 and drying medium export 42 on the circulation passageway. Roll body 1 is the circular truncated cone form, and its contact working face is parallel and level with the horizontal plane, because the linear velocity on the different diameters of drying dish is different, and when the drying roller rolled on the drying dish, the linear velocity that the drying roller main aspects and tip correspond was different, and the drying roller is made the circular truncated cone form and can be guaranteed that the drying roller is unanimous in the linear velocity of the position of drying dish contact, is favorable to better rolling.

The utility model discloses a drying roller, wherein a drying medium enters a heat exchange space through a drying medium inlet, a circulation channel and a connecting shaft, when the drying medium meets the inner wall of the drying roller, water vapor is condensed into liquid water J, heat energy is released at the same time, the heat energy is transferred to a material to be dried through a roller surface, and the liquid water J is deposited in the drying roller and is discharged through a drying medium outlet. The roller surface and the heating plate dry and roll materials together, so that the drying efficiency of the materials is improved. The support of the drying roller is driven by external power, so that the roller body rotates on the surface of the drying disc.

In the utility model, the roller body 1 comprises a first end panel 12, a second end panel 13 and a roller surface body 14 which are welded. The roll surface body 14 is made of steel and has good heat transfer property and rolling hardness.

The roll surface body 14 is cast or formed by roll welding of sheet material.

In the utility model, the connecting shaft 2 adopts two sections of shafts which rotate at the two groups of bearings 3 in a one-to-one correspondence manner; make the inside great space that has of heat transfer space from this, dry medium passes through the dry medium entry and gets into, and diffusion to the heat transfer space behind the circulation passageway makes the quick diffusion of steam, runs into drying roller inner wall condensation release heat.

In the utility model, the inner side of the connecting shaft 2 close to one side of the drying medium outlet 42 is provided with a water pumping pipe 5 with a downward opening, and the water pumping pipe 5 is connected with an external water pumping device. And liquid water J generated in the drying process is discharged through the water pumping pipe and the drying medium outlet. The water pumping pipe is fixed on the hollow connecting shaft and does not rotate along with the roller body, the water pumping port is always positioned below the hollow connecting shaft, and the water pumping pipe is close to the inner surface of the conical roller as much as possible on the premise of ensuring that the water pumping pipe does not interfere with the inner surface of the conical roller, so that the liquid water J in the drying roller can be pumped more thoroughly.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (7)

1. A dryer roll, comprising:

the roller comprises a roller body (1), wherein a heat exchange space (11) is formed inside the roller body (1), shaft fixing holes are formed in two ends of the roller body, and a bearing (3) is arranged at each group of the shaft fixing holes;

the connecting shaft (2) is rotationally connected with the bearing (3) and drives the roller body (1) to rotate; the connecting shaft (2) is a hollow shaft;

support (4), connecting axle (2) fixed support in on support (4), the circulation passageway that has dry medium in support (4), the circulation passageway with connecting axle (2) heat transfer space (11) intercommunication, just have dry medium entry (41) and dry medium export (42) on the circulation passageway.

2. Drying roller according to claim 1, characterised in that the roller body (1) is truncated cone-shaped, the contact face of which is level with the horizontal plane.

3. A dryer roll according to claim 2, characterized in that the roll body (1) comprises a first end plate (12), a second end plate (13) and a roll body (14) welded together.

4. Drying roll according to claim 3, characterized in that the roll surface body (14) is made of steel.

5. A dryer roll according to claim 4, characterised in that the roll shell body (14) is cast or is roll-welded from sheet material.

6. A drying roller according to claim 2, characterised in that the connecting shaft (2) is in the form of two shafts which rotate one to one in two sets of bearings (3).

7. Drying roller according to claim 6, characterised in that the connecting shaft (2) on the side close to the drying medium outlet (42) has on its inside a suction pipe (5) with a downward opening, which suction pipe (5) is connected to an external suction device.

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